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Madonna, Alex Rodriguez

Brian Zak/Sipa Press via AP images; Kevin Mazur/ Getty Images

Madrod has finally made its public debut.

As Madonna completed her second song before a sell-out crowd in Miami's Dolphin Stadium Wednesday night, New York Yankees slugger Alex Rodriguez handed her a bottle of water.

"It was easy for him to hand it off because he was sitting in the front row," a witness tells E! News. "He was all excited watching her perform."

And, just like that, Madonna acknowledged in public, less than a week after her quickie divorce from Guy Ritchie, that A-Rod is indeed the superfan (and waterboy) he's reportedly been for most of this year in private.

The two arrived in town together on Monday and spent most of Wednesday hanging around town with pal Ingrid Casares, a prominent Miami party promoter, who introduced the pair.

Madonna, 50, hit the stage of her last Sticky & Sweet American concert two and a half hours after the show was supposed to start. The Material One played from about 10 p.m. to midnight, including a guest appearance by Pharrell Williams during the closing set.

A-Rod, 33, who very publicly spent Tuesday with his family at a local restaurant, stayed throughout the entire performance.